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Lufft IRS31Pro-UMB – Intelligent Passive Road Sensor for Slip Warning
  • Lufft IRS31Pro-UMB – Intelligent Passive Road Sensor for Slip Warning
  • Lufft IRS31Pro-UMB – Intelligent Passive Road Sensor for Slip Warning
Lufft IRS31Pro-UMB – Intelligent Passive Road Sensor for Slip Warning

Lufft IRS31Pro-UMB – Intelligent Passive Road Sensor for Slip Warning

The market's most accurate sensor for measuring road surface conditions. IRS31Pro detects slippage, aquaplaning and ice formation in real time – without affecting the chemical composition of the road surface. The ultimate decision-making basis for effective winter road maintenance.
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The Lufft IRS31Pro-UMB is an intelligent, passive road sensor designed for flush mounting in the roadway or on runways. As a central part of a modern RWIS (Road Weather Information System), the IRS31Pro measures critical parameters such as road surface temperature, freezing point, water film thickness and salinity. By combining this data, the sensor can accurately predict the risk of ice formation before the slippery road surface actually occurs.

What makes the IRS31Pro unique is its two-piece design, which allows for easy replacement of the sensor unit for calibration or service without the need to re-excavate the road surface. The sensor measures salinity and freezing point completely passively, meaning it does not need to actively cool the surface – saving energy and providing a more representative measurement of the actual road condition. For municipalities, contractors and airports, the IRS31Pro means a drastic optimization of salting and snow removal, saving both money and the environment.
Technical specifications

Measurement parameters: Road surface temperature, Freezing point, Water film thickness (up to 4mm), Ice/Snow/Humidity.

Measurement technique: Passive measurement of salinity and surface condition.

Freezing point measurement: 0 to -30°C.

Temperature accuracy: ±0.1°C (at 0°C).

Communication: RS485 (UMB protocol, Modbus).

Construction: Two-piece housing for easy maintenance.

Enclosure: IP68 – Fully submersible and resistant to road salt and heavy vehicles.
Installation & Commissioning

The sensor is mounted flush with the road surface so that its top is level with the asphalt or concrete.

Easy Maintenance: Thanks to the two-piece design, the electronics unit can be lifted out for calibration without disturbing the road surface.

Integration: Stormex Solutions delivers the sensor ready for integration with Lufft's other WS weather sensors for a complete weather station.
Documentation & Certifications (PDF)

Technical Data Sheet (PDF): Includes measurement curves for freezing point calculation.

Installation guide: Detailed instructions for drilling, pouring and wiring in asphalt/concrete.

CE Certification: Meets all European requirements for road safety equipment.
Support & Warranty

As a Stormex Solutions customer, you can always feel confident with your purchase. We deliver equipment of the highest industrial quality and offer comprehensive support for all our systems.

  • Warranty period: We offer a 2-year functional warranty on all hardware as standard (unless otherwise stated in the product sheet).
  • Technical Support: Do you have questions about installation or configuration? Our technical support is available via email and phone to help you get the most out of your equipment.
  • Swedish expertise: All support is in Swedish and is based in our headquarters in Luleå.
  • Spare Parts & Service: We stock the most common accessories and have close contact with the manufacturers for quick handling of service issues.
Areas of use

Winter road maintenance (Municipality & Swedish Transport Administration): Automate slip warnings to deploy resources exactly when and where they are needed. Reduces unnecessary salting and increases road safety.

Airports (Runway Monitoring): Provides air traffic control and ground personnel with critical data on runway status, including the risk of hydroplaning.

Bridges & Tunnels: Bridges often freeze faster than paved roads. IRS31Pro provides early warning of local frost points that are otherwise missed by general weather stations.

Smart Cities (IoT): Integrate road condition data into the city's digital twin to optimize traffic flows and warn motorists in real time via digital signs.

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